is quantum tunneling possible

Quantum tunneling is indeed possible and is a well-established quantum mechanical phenomenon. It occurs when a particle such as an electron or atom passes through a potential energy barrier that it classically should not have enough energy to overcome. This is possible because quantum particles exhibit wave-like properties, and their position is described by a wave function that allows a probability of the particle being found on the other side of the barrier. The tunneling effect has been observed and is essential to many physical processes, including radioactive decay, semiconductor behavior, and even thermonuclear fusion in stars like the Sun. In fact, without quantum tunneling, stars would not produce energy in the way they do, making life as we know it impossible.